Fix this in DNS by having a host record for both the bare domain name and he www.<domain name> so both will resolve to the same ip. Host headers would typically be for when your server is on one IP but you want to treat the two url's as independent sites, i.e., if you wanted different files for the bare domain name vs. www

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Doug G
======I've never been able to appreciate the sublime arrogance of folks who feel they were put on earth just to save other folks from themselves .." - Donald Hamilton